Referencing a nonexistent filter element should cause the object to be rendered without filters
While drawing an icon I came across a weird bug, where most of the icon just doesn't render at all in Icon Preview.
Inkscape:
Firefox:
Chromium:
Since browsers don't render it correctly either it's likely an issue with the file, but it's quite odd because there's nothing especially interesting about this icon (no masks, filters, etc.).
The SVG in question: